Thermodynamic properties of liquid silver-gold–gallium alloys determined from EMF measurements with solid YSZ electrolyte

Highlights: • New experimental emf data for the Ag-Au-Ga system. • First published values of the gallium activity in liquid Ag-Au-Ga system at 1223 K. • The liquid ternary phase is described by using Redlich-Kister-Muggianu polynomial. - Abstract: The thermodynamic properties of liquid Ag-Au-Ga alloys were determined using solid oxide galvanic cells with zirconia electrolyte: W, Ag_xAu_yGa_(1-x-y), Ga₂O₃//ZrO₂ + (Y₂O₃)//FeO, Fe, W (I) in the temperature range from 1023 to 1348 K. Measurements were conducted in the ternary Ag-Au-Ga system along three cross-sections specified by the ratio of mole fractions x_Ag/x_Au = 1:2, 1:1 and 2:1. Thermodynamic properties of the liquid phase were described with the Redlich-Kister-Muggianu formula. In this description procedure, the heat of mixing determined calorimetrically in the previous work was included. The results of the calculations were compared with the experimental data obtained in this work.